Development of Brushless Claw Pole Electrical Excitation and Combined Permanent Magnet Hybrid Excitation Generator for Vehicles

Abstract

Aiming at the problems of large excitation loss and low power generation efficiency of silicon rectifier generators and the unstable output voltage of permanent magnet (PM) generators, a hybrid excitation generator (HEG) with suspended brushless claw pole electrical excitation rotor (EER) and combined magnetic pole PM rotor is proposed in the present work. With only one fractional slot winding stator, the generator adopts PM field as the main magnetic field and electrical excitation field as the auxiliary magnetic field, which not only retains the advantages of high efficiency of PM generators but also effectively reduces excitation consumption. The main structure parameters and the design method were analyzed, and a simulation analysis of no-load magnetic field distribution and flux regulation ability was carried out using finite element software to verify the rationality of the hybrid excitation parallel magnetic circuit design. Moreover, the no-load, load, regulation, and voltage regulation characteristics of the designed generator were tested, and the results show that the designed generator has a wide range of voltage regulation, which can ensure stable output voltage under variable speed and load conditions.

Electromagnetic Design and Flux Regulation Analysis of New Hybrid Excitation Generator for Electric Vehicle Range Extender

“…rough reading the above references, the author found that combined PMGs have strong magnetization ability and high air gap magnetic density [22,[26][27][28]. In addition, the brushless EEGs have good air gap field adjustment ability and high reliability [29][30][31].…”

Modern Hybrid Excited Electric Machines

“…The comparison of different structures of hybrid excited electrical machines is very difficult because of their variety. They can be compared, e.g., in terms of their external characteristics (mechanical design) [1][2][3]21]. Hybrid excited electrical machines can also be categorized according to the path-determining design of the combined excitation flux.…”

Optimization Design and Performance Evaluation of a Hybrid Excitation Claw Pole Machine

“…However, it is difficult to regulate voltage and is easily affected by temperature. Hence, the hybrid excitation method is introduced as a decent candidate for the EV system [13][14][15]. In a hybrid excitation claw pole machine (HE-CPM), the PM excitation can bring high power density and the field excitation ensures good flux regulation capability [16,17].…”